<?php

ob_start();
$output = '';

if(isset($_POST['submit']))
{

	$error = array('fName' => false);

	$_POST['fName'] = isset($_POST['fName']) ? trim($_POST['fName']) : ""; // data initialization and sanitization
	// ...
	// ...


	if($_POST['fName'] == '')	// error checking
		$error['fName'] = true;
	// ...
	// ...


	// behavior
	if($error['fName'])
		$output = array('code' => 1, 'msg' => 'There was an error with your input. Please go back and enter all the details.');
	else
	    $output = array('code' => 2, 'msg' => 'Email Sent');
}

echo json_encode($output);

$printscreen = ob_get_clean();
file_put_contents("printscreen.txt", $printscreen);
echo $printscreen;

?>